(桂林電子科技大學(xué) 廣西信息材料重點(diǎn)實(shí)驗(yàn)室，桂林 541004)
摘 要: 采用電弧熔煉法與高能球磨相結(jié)合的方法制備Y-Fe-Cr合金微粉，將制得的合金微粉放在真空石英管中在850 ℃下退火2 h，采用XRD和SEM對(duì)合金粉的相結(jié)構(gòu)及顆粒形貌進(jìn)行分析，最后利用矢量網(wǎng)絡(luò)分析儀對(duì)合金粉末的吸波性能進(jìn)行分析；并以Y11Fe86Cr3為例研究熱處理對(duì)Y-Fe-Cr合金微粉吸波性能的影響。結(jié)果表明：在吸波涂層厚度(d)為1.5 mm的條件下，YxFe97−xCr3(x=7，9，11，13，摩爾分?jǐn)?shù)，%)合金微粉都具有較好的寬頻特性，在低頻端，Y9Fe88Cr3的吸波性能優(yōu)于其他合金的吸波性能，在7~18 GHz頻率范圍內(nèi)，Y7Fe90Cr3、Y11Fe86Cr3和Y13Fe84Cr3的反射率均小于−6 dB；在d為1.8 mm的條件下，在吸收峰附近，熱處理后合金的反射率較熱處理前的反射率得到明顯改善，熱處理前合金的吸收峰值為−10.5 dB左右，而熱處理后合金的吸收峰值達(dá)到−13.8 dB左右，而且小于−10 dB的帶寬達(dá)到5 GHz；在偏離吸收峰處，熱處理不但達(dá)不到改善合金吸波性能的目的，甚至使合金的吸波性能變差。
關(guān)鍵字: Y-Fe-Cr合金；吸波材料；電弧熔煉法；高能球磨
（Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China）
Abstract:The Y-Fe-Cr alloy powders were prepared by the arc melting method and high energy ball milling, then the powders prepared were sealed in evacuated quartz tubes for homogenization annealing at 1 123 K for 2 h. The phase structure and the microstructure of the alloys powders were analyzed by X-ray diffractometry and scanning electron microscopy, then their microwave absorbing properties were analyzed by vector network analyzer. And the effect of heat treatment on the powders by sample Y11Fe86Cr3 was studied. The results show that the YxFe97−xCr3 (x=7, 9, 11, 13, mole fraction, %) alloys powders have better wide-frequency characteristic under 1.5 mm of material thickness. At low frequency, the microwave absorbing properties of the Y9Fe88Cr3 alloy are better than those of the others. The reflectivity of Y7Fe90Cr3 , Y11Fe86Cr3 or Y13Fe84Cr3 is lower than −6 dB at microwave ranging from 7 GHz to 18 GHz. The reflectivity obviously increases after heat treatment under 1.8 mm of material thickness; near the absorption peak, the least reflectivity turns from −10.5 dB to −13.8 dB, and the wide frequency of reflectivity under −10 dB achieves 5 GHz. Nevertheless, the heat treatment can not increase but decrease the microwave absorbing property except the region near the least reflectivity peak.
Key words: Y-Fe-Cr alloy; microwave absorber; arc melting method; high energy ball milling
